Nice work - everything appeared to work as intended and I ran into no bugs (I guess someone else found one lol). I agree with the idea that the premise and the provided scenarios work well as a tutorial for something more if you wanted to push for it. You differentiated the different player mechs well visually and mechanically; good job on the sprites, and for a first pass on balance, I feel like this is pretty good if a little bit easy. With more time, you could have death animations for each model, and maybe some more SFX (I see those weren't credited - did you make them? Just asking - good job if so, I know a lot of people shy away from it if it isn't their thing).
Initially I felt like the pacing was a little slow when the enemy was making its moves; like I wanted a button to be able to speed up the AI portion, but that might be a modern brain problem and actually the pacing is something to be relaxed into, since eventually I feel like I kind of did. I'm not sure if this makes sense in the genre, but I could see a little unit-specific progression system or options for different player units per-scenario being interesting ways to increase player expression in the game. Nice work on a fun submission! This type of game seems like an interesting platform for different ways to challenge the player at a different pace than a lot of other games do.