Hey hello and thanks for your time and your comment ! So yes for the button who spend all the money that was a bug (yet fixed).
There is indeed an end to every level (9 to 12) waves something like that I'll put a progress bar or something like that to improve feedback.
As for the HP lost while pause I'll try to reproduce the error and fix it.
Thanks again ! (I'll update the game tomorrow when I'm done adding some sound effects)