Very fun, very action packed. The sound design really helped sell the hits.
I unfortunately couldn't make it past wave 7 lol, so maybe there was a boss battle I missed out on. With that said, it maybe would have been nice to see more enemy variety, and maybe some variation in the soldiers' firing (all of them firing at once is very menacing but it's a little strange compared to other games of the genre IMO).
Also, a different font could fit the style of the game more.