A single-screen, platformer, battler/brawler.

Similar one would be

Jump’n’Bump - Cute battle-royale, jump on oponents heads to be last bunny standing.

[Jump’n’Bump for download] (github.com/midzer/jumpnbump) (GPLv2)

Jump’n’Bump, play in browser

Or a multi-screen battler:

Teeworlds - Grappling hook, platformer shooter. (zlib)