Really interesting game!
Graphically looks really nice, making good use of the available palettes. and the music tracks were fantastic.
Could definitely make use of a confirmation button on level up or something, as it was very easy to accidentally skip over it.
The random enemy spawns combined with their fast movement would sometimes cause me to take damage before I could do anything upon entering a room (happened while on the threat level 3 red planet) which was rough,
Overall a very interesting entry, could see myself coming back to it at some point to see if I can beat it, though the global timer seems fairly intimidating (but from the pace I had on the couple runs I did before dying, it seemed fairly generous, maybe more of a thematic thing/incentive to stop the player grinding forever on low threat planets and actually explore and take risks.