hi, thank you. So what are you think to upgrade?
hmm think i would add some kind of game over mechanics next.. and play arround with the settings so that it will feel rewarding to reach a higher stage... afterwards I probably would go for some enemy variation... so that there are maybe some new strategies to uncover when reaching the higher levels maybe coupled with some different weapons or special abilities you might unlock... but for the beginning as said earlier would focus on a "game over mechanic first" ... probably with it it can already become quite addictive