I have a 5 page word documents with things to add, I would have added more upgrades and especially more that feel unique and give broader build options, I also would have added more enemies, fixed some bugs, made the ui more beautiful and I would have added a win condition by walking left very long you would come to a tower were you figt a mini boss and there are two of these towers. when beating both bosses a timer would start after that timer the end boss would spawn after that you would have won the run and could play endless further. I would have added a timer so you can try to speedrun it but there wouldnt be any content outside of the gameloop etc. so its more of a highscore Rogulike and not one where you need to unlock a thousand things before you can play the game properly