FREE GAME SHMUP: Cho Ren Sha 68k
http://www2.tky.3web.ne.jp/~yosshin/my_works/download.html
Here what you needed:
www.acid-play.com
www.tigsource.com
mulengine.itch.io
www.portablefreewaregames.com
www.caiman.us/
https://web.archive.org/web/20111101011105/http://www.curlysworldoffreeware.com/
https://www.blueskied.com/
http://www004.upp.so-net.ne.jp/x_xgameroom/Works/works.html
www.locomalito.com
http://www.ragdollsoft.com/
http://www.interq.or.jp/saturn/takuhama/games.html