It's just Gemini, except more... Funner.
The unofficial remake of Kampfers map, Gemini, is my improved edition, Jumeaux. Also, the sequel/prequel to TecnoIds first map, Caverns 2, comes Ravenous, an exciting puzzle shooter. Notes: The bug appears on jumeaux, where you step into the teleporter. Be careful which one, becuase one will crash Aleph One.