Hey, it's a Doom mod! These things were all the rage in the 90s when the game was popular. Maps and sprites and all kinds of adjustments to the game used to be a big deal. It's nice to see someone pick it up again and run with it. Not much else to say other than that look at how Doom handled level design for inspiration - some of the corridors are a little too large and entry areas usually don't have enemies attacking you at the start of a level. 

Thanks for submitting ZOMBITOWER3D to the SCREAM MACHINE game jam! 

- SCREAM CATALOGUE

This is awesome but i'm having trouble turning the mouse unless im moving forward or backwards. 

I haven't played a Doom style game in quite a while, so thanks for that! This was a fun time.

Really cool to see something using a doom engine, nice work!