This is a great take on a rogue-like that fits the fire inspiration and color limitation really well! Love the NieR influence as well. Only being able to shoot straight in the cardinal directions in combination with losing health with every shot really encourages the player to be mindful and precise with their movements and shots. Having an endless mode is really impressive for such a short jam!
Only critique is that the UI is a bit messy and difficult to parse, especially for an action game where things move quickly. Having more icons alongside the text, or spelling things out like "Score" clearly would help with this. On the other hand, some of the upgrades were difficult to infer what they were going to be before picking them up, because they are only icons with sometimes vague designs that have no link to the UI.