Idk whether it was intended this way or not, but I noticed two more problems on the web version:
- The cards drop the same (between waves, as I understand, there should be 3 random cards, but there are ever 3 identical ones)
- It is extremely difficult to get into the UFO (damage only goes through some random pixels)
Otherwise, it's a cool game, although in places (maybe because of bugs) it's slow