Tip for someone struggling with first level - just buy regen and then DO NOTHING! Or you can just do nothing but you will take damage and will not have upgrade. It's kinda strange that first level is like most difficult one and only previous comment inspired me to try again. I appreciate the concept, even tho balancing with this would be really hard i think. Button "Carpe Diem" is also interesting idea, but imho game has a lot of waiting time, you could speed up at least this moment and mb have controls for changing time speed. Anyway, good visuals, not bad audio, decent game overall