Yes, the 10 points was basically to make sure that you always had the possibility to upgrade something for the first few rounds, when you might die on the first enemy.
Definitely agree on the bonus points disappearing, that's a great idea!
The enemies were actually supposed to change color for every new level, but because of stress/time/last-minute-fixes etc I commented that out :/.
It was supposed to have different color schemes for every new level (every 10th wave).
Thank you for playing it!