This was really cool and controlled really well... kinda. What I'm about to say might be more because of my potato laptop, so take it with a grain of salt and get more feedback on this specifically: The browser build, the one I played on, seems to be slow for me. It started out perfectly fine, but once I got a room or two in, I could notice it slowing down. And in some places, it even sped back up when there wasn't much going on like in a save room or in a room off in the corner, so it wasn't like a consistent slow down. Maybe it's something to do with the enemies? I also had originally played on Sunset, which seemed to somehow make it slower(?) and I got trapped after I got the spring platform and broke my first objective as the door leading out of the area wouldn't open. Like, at all. I reloaded the room multiple times and nada. I was well and truly stuck in there. When I rebooted the game, I just left the settings alone and it didn't happen again, so I am unsure if it was Sunset specifically that caused it, or if it was a freak bug, or if maybe the slow-down issue had somethin to do with it. If this slow down issue isn't local to me or if maybe it's a quirk of the web build, it's worth looking into. If it is just me, then ya probably don't gotta worry about it too much.
Other than all of that, the 1-bit style is really really nice, everything stands out pretty well, sound effects are very satisfying and fit really well, the animations were nice and fluid, and all and all the entire presentation was great. Only thing I'd have to say about gameplay is I think the bosses may have just a tad bit too much health for my liking, though it's hard to give full judgment since the slow down was not helping in making them feel snappy or satisfying. Just kinda slow. Again, get some more input there if possible to see if others are experiencing it too in case I'm the odd one out. Still though, great work and really cool project you got here! I quite enjoyed it.