Very cool game, I enjoyed the color aspect of it and was getting some reverse half-life vibes I really enjoyed. The gameplay felt good and I enjoyed the voice acting from the soldiers.
If you wanted to improve, I suggest adding hidden lore in places to explain what the aliens are and where they are from, stuff like that. Based on the "to be continued" I think you are either going to expand on it or create a follow up game. Either way I'm excited for it!