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Thing-Thing game created by Sean McGee, also known as Weasel. (not me) The game is somewhat reminiscent of Madness 小ombat in its style, as the characters are depicted with their arms raised and their cruelty. The very first game was released in 2005, and the last one in 2013. For most of the game, it's an arena with enemies spawning that must be destroyed with other weapons, from pistols to blaster rifles. There is also a chapter development called "Arena" which you can kill enemies, zombies and others.
This includes:
Thing Thing (level of violence: low)
Thing Thing 2 (level of violence: low)
Thing Thing 3 (level of violence: normal)
Thing Thing 4 (level of violence: high)
Thing Thing Arena (level of violence: low)
Thing Thing Arena 2 (level of violence: normal)
Thing Thing Arena 3 (level of violence: high)
Thing Thing Arena Pro (level of violence: high)
Thing Thing Arena Classic (level of violence: high)
Thing Thing 2: Alpha (level of violence: low)
Thing Thing Maker (no cruelty)
The Thing Thing 4 Trailer (level of violence: high)
And a Guide.
Sources: https://archive.org/details/Thing-Thing-Collection