Nice little arcade game! It's a bit simplistic, but it's got some good vibes, I liked the varied Glum behavior as it creates some challenging patterns to deal with when they overlap, and the risk/reward of consecutive bounces and flips to get a hi-score is cool. I don't really care for the colors and hats as much as others likely do, but the challenge room with hard mode is a nice bonus.
Some subtle aspects that I enjoy are the fact that the Glums have animated attack telegraphs: it does a lot to make everything intuitive and avoid unfair/cheap deaths from sudden attacks. As grim as it sounds, I also love the death animation: the sudden freeze and the explosion afterwards gives me old-school vibes like the Adventures of Lolo (and I like that you can skip it once the novelty wears off!)
If I were to have some feedback, it'd be:
*While they are generally ok, the hitboxes can be a bit wonky at times where instead of my character getting hit, it's more like the invisible space of their bounding box gets hit. Also I've had some rare times where I totally jumped on top of a vulnerable non-attacking enemy and I get killed instead of bouncing off of them for some bizarre reason.
*The tutorial window is terrible as not only is the text grainy/distorted, it auto-advances too quickly for me to read, and when that happens, all I can do is hit the block to start the sequence over and wait for it to get back to the page I want to read. Ideally, you should hit the block to advance to the next page when you're ready.
*While you do get some sparkles and sounds when you do a high number of flips which is nice, I wish that the feedback would be more specific: I'd love a number to pop up for how many flips I've done during the sequence, and how many points I got when I end my flip combo.
*I'm not sure as perhaps I'm missing something, but it feels like the game is stagnant, meaning that it doesn't increase in difficulty the farther you get, and that means that once you get good enough, high scores are just a matter of patience, not skill. Ideally, I'd like the game to speed-up or perhaps transition into hard-mode after a certain amount of time or points.