These are mini-projects that I don't consider complete enough to call games.
Still, they may be interesting to you.
Ping vs. Pong
Sand Particle Simulator v2
Sand Particle Simulator
Rigid Circle Physics
Soft Circle Physics
Barnsley Fern Generator
Implementation of the Chaos Game
An experiment with diffusion.
A small mouse-following diamond.
A combination of the previous two tests
A test of distance-based point lighting
An interesting design generator
Testing my Rectangle class
Testing polygon destructibility (uses PolyK.js by IvanK)