Pretty cool game! Reminds me a lot of games like Realm of the Mad God, or perhaps some competitive form of Risk of Rain. Certainly looks to be a rather charming game in terms of presentation and while it's already quite fun in its single-player state, I'd be very interested to see how the gameplay shifts when you need to deal with other players competing and sabotaging each other. Overall it looks incredibly promising and I'm sure loads of people are gonna love it.
Having said that, though...the game really didn't work for me personally. It's still good, but I felt rather underwhelmed despite what looks like a quality product. It's hard to nail down exactly what it is, but something about it just really didn't gel with me: both the micro minute-to-minute combat gameplay and the macro mechanics of levelling and looting just felt really awkward, confusing and unsatisfying. If it helps, I think it's most likely a personal preference thing, similar to how I don't like The Binding of Isaac that much, but can still see why many others would like it. If I were to offer some feedback, though, it'd be:
*This is a bit vague, but as said, there's something about the combat that just felt really off to me. Maybe it's the slow projectiles, maybe it's the hitboxes being placed or sized oddly, maybe its the way the enemies are placed in the world that doesn't match when viewed in a 3D perspective, maybe it's the hit/death feedback, maybe it's that projectiles can clash, there's just something about it within the nitty-gritty that just didn't work for me. I don't have anything specific, unfortunately, so it's up to y'all.
*I was constantly trying to use my RMB skill and being shocked that it wasn't ready yet. It's ok that abilities have long cooldowns if that's what you want for strategy purposes, but I'd like it if you try to use an ability before its ready, that it notifies the player, like having the cooldown remaining flash above the players head briefly, and their character makes a little noise or shakes about.
*I'd like it if loot on the floor has the little info pop-up when your character goes near/over the item, not just when the mouse hovers over it: would make it a lot more convenient to examine loot as typically I'm trying to fend off enemies and I don't have the luxury to mouse over loot during that.
*For a game that's all about racing to level up, levels come and go with the player barely noticing it. At the very least, I'd like it if there was some more fanfare when you level up to give a sense of gratification, but you could also make gaining exp a bit more exciting by turning it into crystals as they do in Survivors games: this could have the added benefit of making multiplayer a bit more exciting as players could plan to steal the crystals that scatter from another player's kill.
*I found it very confusing to grasp the whole class unlock system: why am I having to jump through all these weird hoops to have fun? I just leveled up, so let me pick whatever one of the two classes on offer I want instead of giving me no choice at all unless I do these quests that I don't even understand: the ones that take honor to unlock are self-explanatory, but I have no idea what the other requirements mean.
*I don't feel like the tutorial prepared me for the game properly. Sure, it goes over the basic controls, but I felt completely unprepared for the actual game as I had no idea I wouldn't be able to start as the fire mage immediately, I didn't know about collecting keys and ascending classes and searching for bosses and competing against other players and moving onto new zones and all of that jazz!
*Loot was a bit boring and devoid of anything really exciting besides minor statistical increases. I also don't know what some of the stats mean, like bullet HP.
*Bit frustrating that you can't pause and read tooltips and such at your leisure. I know it's because it will eventually be a multiplayer game, and eventually I'll learn everything and won't need to pause, but still, it was frustrating, especially since I'm playing it single-player at the moment.
Looking forward to seeing how this shapes up with its final release: as said, I think the multiplayer aspect could be very interesting!