Bug fix mandatory

It appears that the enemies in Space Invaders fire shots that are virtually invisible on some machines (having both a CRT display and LCD displays, I can note the difference) Is there any reason the enemies fire these 'invisible' shots? They cannot be dodged, as they seem to track the player. This gives the illusion that you die randomly, thus ending a good game. If possible, I would very much appreciate if this bug is fixed, or at least addressed. It is frustrating to have more than 500000 points and then suddenly die due to these shots. Once more, please address and repair this bug, and explain why these invisible shots are in the game. Thank you very much!!

We haven't experienced this, we will take a look

These invisible shots are gone now; I have not had any problems with Space Invaders. However, there are some shots that are very hard to see. Are those part of the game?

Things should be okay now. The new idea of 'leveling up', that is, the enemies firing increased shots at you, makes the game more interesting. I guess no one will beat my 900 000 points now...