I thought about the crosshair about 5 minutes after the deadline ended but definitely was something we'd planned and hadn't gotten around to.
The bullet speed could possibly be adjusted some, it was made to feel 'good enough' at the start of the game but the alien bombs do start to drop faster and get to the point where you have to premptively 'Flak' the area to stop incoming fire. Of course that can cause you to blow yourself up if you're not careful.