A nice ending to the series, bravo. I really enjoy the series, except for the part about having to fill in numbers. Great games and keep up with the good work!
Not bad, but there are areas you could improve on:
1. Slight increase in movement speed.
2. Increase ROF for 2, 3 and 4th weapons; right now their slow ROF makes them less useful.
3. Upgraded armor should increase your HP automatically instead of forcing your to regenerate your extra hit points.
4. 2nd upgrade for your primary weapon should get and more damage. Right now there is a big gap between 2nd and 3rd upgrade.
5. Your side should get upgraded infantry as the waves goes on, just like the enemy. Not too powerful but at lease they should get plasma weapons.
Overall, it is quite a fun game to play and NORMAL difficulty is beatable but slightly more tedious. I am giving this game 3/5.
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