For your first game this is super impressive! I liked the overall feel of the player character and the kaizo blocks were fun lol. The maps were cleanly designed, overall had a good feel to it. My biggest note would be to have better indicators of death and what killed you - it seemed like I'd get killed somewhat randomly. Sometimes it would happen when I'd get crushed underneath by a block, but sometimes it would happen just by touching one. The collision was a bit janky in this regard.
Still, had fun. Good work!