I really enjoyed this little shooter. I personally have never seen anything like the 3D buildings from gDevelop, which is really cool. I feel like sometimes there was a bit of an error with shooting. Sometimes the bullet would go straight through the zombie, without doing any damage. The sound and visuals were pretty cool, though. Overall, I think this was a fun and simple, yet slightly tricky game. Kinda reminded me of an old-school snes game or an arcade game id see in bowling alley.
Good work!