Nice job getting to the end man!
1. The boss has a glaring weakness unfortunately and it does seem fairly easy in comparison to the other enemies. I will be trying to balance out the game more in the future updates to improve this.
2. Mortars are pretty op. Increasing the weapon size(like the plasmas) would probably help protect against this type of spam.
3. I actually didn't realise that some enemies didn't generate enough energy to fire. It hasn't been directly brought up but I have heard reports of enemies just not shooting. This is what must cause that too happen. Nice observation there. Enemies shouldn't only be equipped with flares. I'm pretty sure I double check the enemies' firepower to make sure they can actually deal damage(provided the have enough energy). I will look into the energy placing system.
I'm glad I was able to nail most of the bugs. Feels great to know that my errors aren't having a impact on the gameplay as much. I am very glad you enjoyed playing it. Stay tuned for more. Next update will take a little longer, but I'm trying to get a little more in there.
Thanks for taking the time to give some great feedback that will really help me to develop this further!