Ah a good old isaac clone. Well done for a jam game too! It's not that often to see jams games with proper level generation system in place. Must be a lot of work! Good job!
The gameplay is also quite smooth too, besides the occasional lags that probably came from a web build, it quite well done!
For some feedback I'd say the room is a bit on the large side, and backtracking sometimes feels a bit slow. There are also issues where you spawns in an incorrect position when entering a room. I don't know if this is an Easter egg or not, but I entered a strange white room by accident and seems to get stuck eventually in a strange shop. Not sure what it is.
Anyway, good job on making this game!