Love the idea! I think showing the enemy positions for a few seconds before they spawned was a great way to let the player prepare for the next attack, it felt very fair and rewarding. If you wanted to keep developing, I think a progression system would be awesome. Maybe after every wave it opens up a little bit more of the map, eventually expanding to become a huge sprawling play area. Overall I was a big fan of this entry, keep up the good work!

Cool game , It,s really fun, I can't seem to get enough with shooting zombies in this game, i find it really satisfying. Maybe consider changing the map every few level. Overall it's a really fun game, Well-Done!