I am having problems to understand controls.

I'm not sure if its an issue on my end, but sadly the game wasn't working very well for me. I tried with different browsers but no dice. It's also not very clear which buttons to press, I pressed space and the symbiote moved, none of the other keys worked. It eventually reached the end of the hallway and the game was restarted.

Regardless, let me say that I'm a huge fan of Inverse Kinematics, and making a procedural walk cycle is very impressive. Great job there!

Just some quick constructive feedback: Consider adding some clarity to the game mechanics (objective, keys, etc) and more gameplay elements. Maybe some enemies, or maybe the symbiote needs to stop at times to avoid obstacles that get in the way.

Keep up the good work!