I enjoyed the game. It's hard and appears tiny on my HiDPI screen (java icetea on Ubuntu 18.04). What I liked the most was the sound effects (good sounds, synced nicely with actions) and the fast pace of the game made it flow well. The bad parts were the mis-aiming could be cruel sometimes and the AI was a bit dodgy here and there. But a fun game!
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You should be able to resize the window - at least on windows, no idea if you can do it on ubuntu.
Zombies have rather small hitbox compared to their appearances, that was because of wall collision system uses the same hitbox as bullets do. And I have to make them small to fit them better in small spaces. (I made the collision system within jam period lol)
Thank you for feedback!