Oh wow, this is some amazing stuff! Really feels like a NES hidden gem with the way it pulls off the aesthetic so authentically with fantastic visuals and audio, and the gameplay is wonderful with how good the movement feels, how interesting the levels are to explore with loads of neat secrets and new mechanics being introduced like shroom power, and so many other great things like the crazy boss fights (seriously, that second boss is like something straight outta Cuphead). It just feels like a damn good adventure and practically drips with charm from every pore!
Again, it's amazing stuff that you should be super proud of, but if I did have some feedback, it'd be:
*Curious about some of the aspects like the cockroaches that fly away: are they some sort of bonus speedrun objective, like you need to reach them fast enough to hit them before they fly away? Also curious about the little baubles you pick up: they get sucked out of you at the end of a level, but I was never sure if I was having any sort of effect with how many I gathered: does it matter?
*The map can definitely be a bit confusing to navigate at times. Plenty of times I'd walk to the side of the screen thinking it was a transition point but it wasn't, and plenty of times I'd walk where I thought it was ground but was actually a ledge or other such things. But at the same time, I feel like I'd always find the right way to go without too much issue, so hey, it still flows well in the end.
*My biggest issue with the game is that it doesn't seem to have a save/load system: got really bummed out when I got all the way to the third level and wanted to take a break, only to come back and realize I'd have to do everything all over again from the start. Maybe the game isn't technically that long in reality, but c'mon, some checkpoints between levels would be much appreciated.