Hey Blue9Fairy. I just like this minute uploaded an updated version that's a bit easier, with an expanded ammo count. Might be worth a try. Also, examine enemies in the prewave phase and look at the second white box next to their move names. The black lines show which row their attack targets. This will make it easier to see which angle is safest to attack them from.
Also, for ammo, you can manually reload by pressing R, so you're not stuck automatically reloading while being attacked. Hope it helps.