Pretty cool game ! The random room generation is impressive. You mentionned it in another comment, but I think the game really neeed iframes. Currently you basically get one-shot since enemies have such dense bullet patterns ^^’ You could also make the bullets more visible, with higher contrast. Other than that, well done !
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I plan on adding those in the future, sadly ran out of time, but there will definitely be an update to make this more playable. For the level generation I think displacing premade rooms would make the game a lot more fun, since you can get stuck with an annoying enemy in a tiny corridor and have to reload it.