I absolutely recommend Epic Battle Fantasy 5 and 4 first and foremost. 5 have also been ported to phones. In addition Creeper Wars 3-4. Gemcraft seeies. Sonny 1-2. The Elephant Collection just released on Steam. Also Meatboy (the og prototype for SMB). Monsters Den. Robot Unicorn Attack and Canabalt if you want an endless runner. Off the top of my head. Several of these have a souped up Steam version if you want to support the devs.

I absolutely recommend Epic Battle Fantasy 5 and 4 first and foremost. 5 have also been ported to phones. In addition Creeper Wars 3-4. Gemcraft seeies. Sonny 1-2. The Elephant Collection just released on Steam. Also Meatboy (the og prototype for SMB). Monsters Den. Off the top of my head. Several of these have a souped up Steam version if you want to support the devs.