Really nice visuals, I feel like this game has legs it just needs a bit more tweaking of the level layout. Good job!

I liked the idea of classic DOOM-like shooter, but bigger map with height difference will make the game more interesting. Also liked that you can play with standard weapon on harder waves anyway, but it will be harder.
Bugs with the map(holes) causing bright flashes spoil the enjoyment of the game, it would also be nice to fix them and upload the fixed version of the game.

The map looks nice but is a bit small. More movement freedom could improve this game a lot. Also turning up the music volume would do a nice job. The light effect for the spawn is waaaay to bright, i looked into it and tended to be blind for a second.

The Weapons are nice as an idea of combining it with the icons of classic windows programs. Sad is, that the last weapon only recharges, when it is equipped. But the shoot mechanics work nice and its cool that bosses are involved.

Great job. But it wouldn't hurt to improve the balance.