I like the concept but at the moment it's kind of grindy. Like the spiders in the second room, there was no way to beat them until I'd killed the first spider about 10 times and amassed enough cash to buy a few upgrades. This sort of grind is fine when the levels are randomised every time but when it's the same layout and enemies it feels a bit redundant. I can see you decided againt doing this but I personally think it's the randomisation after each death that makes roguelikes tolerable. Especially considering there's no reaction-based skill involved in your game.