Update:
- Invulnerable Canoptrix Ultra have been fixed
- The game now has 36 levels instead of 12. This is my workaround for the campaign because I can only equalize the difficulty between maps on level increase. So the more often a level increase happens, the more opportunities I have to equalize the levels. Balance is unchanged, so level 1-3 spawn forner difficulty lvl 1 waves and 4-6 spawns lvl 2 waves.