Well done, love the addition of different enemies over time. Those big blue guys were great. I enjoyed the different enemy combinations across the levels. Little too easy but at the same time it kept me on my toes. Only think i didnt like was hitting pause to get the upgrade menu. I play wasd so i had to my moves my fingers off to do it. Not a big deal in this game but i didnt like it all the same. Loved the boss fights and the powerups. Upgrades to all the right things and affordable considering the length of the game. Good job.