Alter Ego
Alter Ego is a clever retro styled single screen puzzle platformer with an interesting swapping mechanic. You control a blueish little guy and his phantom alter ego (that moves in a mirrored fashion) at the same time. Swap places with the invincible alter ego to reach normally unreachable corners and collect all the pixels to solve each stage.
The game is freely available for PC, NES and ZX Spectrum. Moreover the Chiptune Soundtrack can be found here.
NeonPlat Adventures
NeonPlat Adventures is a sidescrolling platformer with abstract colorful graphics that happens to be the sequel to NeonPlat 2. Jump around in a trippy world, collect stuff, and use several weapons (orbs, grass, flowers) to defeat the baddies.
The game is available for Windows, Mac and Linux.
Mega Mash
Mega Mash is an interesting genre mix that features 7 different games. It’s basically a bunny-ninja-platformer-shooter-tetris-breakout-balloon-bomberman-mash-up. Every time you touch a fuzzy barrier you will switch into another game world.
Dino Quake
Dino Quake is a single screen platformer inspired by Tumblepop and Joe & Mac in which you control a dino that pounds the ground to generate quakes to defeat enemies. It features also a 2 player co-op mode.