Game Ideas for someone who understands, but wants to improve, collision?

What do you think JGO?

Lunar Lander should help you get to know generic convex polygon collisions (probably using the separating-axis theorem).

Thanks for the reply, could you shine a light on what you mean by lunar lander? ;D

http://moonlander.seb.ly/

What about a simple platformer?

That would be a good start I guess.

ugh euclidian algorithms hurt my mind.