Yeah you managed to spot every issue the game currently has xD
I ran into that problem too, when maxed out you cannot play anymore and this was absolutely not intended ... Another bug to fix i guess x)
And yes, i will balance the game a lot for next updates, while fixing all issues, no worries. I will also implement some additionnal enemies/weapons/bonus, so stay tuned to try them ;)
Thanks again for your playtesting it means a lot to me ! And congrats for the first place on the leaderboard !!