Generation based evolution with a great concept was incredible! The tutorial was just STUNNING! Well done! :D
A few feedbacks-
- The player health in the middle bothered too much, now I know you wanted it to move with player but at this point top/ bottom or on one corner would've been better.
- The left overlay UI looks good but given small ingame area, it takes up a lot of playable space.. instead the game scene could've been limited to a smaller screen area separate from the UI on bottom-right corner.
- Speed should've been clamped or gradually harder to evolve as at last point it was really hard to control for aiming.
- Increasing life span by only a second felt tedious at first as I kept dying but I guess that's the only way to get more generations. Could start from a higher number like 5 seconds could make this feel better.
Good luck on future projects!! :)