I was attracted by this game visuals (I love the color palette) so I play and rate it!
OMG I didn't expect the game to be so difficult! I have seen that you want to keep the difficulty high so I will not give feedbacks in that direction, but there are some things that could have been improved.
For example the flying enemy explosion seems only an animation and not something that could kill you. If the difficulty is high these types of visual feedbacks must be clean to the player or they will be perceived as unfair.
Except for that very nice game and the risky shield mechanic is super smart, good job!
If you try mine, let me know what you think!