This game sets out to copy Metroid. You might be thinking, “Of course it does, it's an indie game”, but this one is copying Metroid rather than Super Metroid. Naturally, this means the power ups are bog standard for the genre, with the usual sort of missile upgrade and power upgrades, nothing that will take you by surprise if you've played literally any other game in the genre. It’s like they came up with the concept of a cat in a robot suit being the protagonist and counted on it being funny enough to carry the entire game, because nothing else is interesting enough to be the selling point. It’s cute, but not cute enough to keep you fixated for more than two hours. If you have a couple bucks to spend and want a Metroid-inspired game, you could do worse, but I don't see why you wouldn't just pick up Hollow Knight to do a lot better.