Sure thing! Here's everything I thought about:
- the player pivot should be in the center of the sprite, otherwise the rotation feels a bit weird
- the movement of the antibodies could be set to smooth interpolate between the start and the end of their trajectory
- bonus: if set in a bigger world with more tunnels it could become a sort of metroidvania, where you need certain abilities and antibodies to progress through the tunnels
Hope to be of any help!!! :)