Song 1: The rhythmic "engine" between the drum and the bass is very well made. I feel like the synth part could use some work, something not quite fits there. Overall solid composition and ambiance!
Song 2: I didn't quite like this one, the intro feels a bit more crowded (but I can imagine it in something like a fight scene), and it gets a bit repetetive. The chords in the end feel very basic and could use some different notes there to spice things up.
Song 3: The pounding drum + bass fit very well. The intro composition is very interesting and recording it yourselves is great! In the second half, I feel like the song became too crowded, with too many elements competing for space.
Also, would be great if you cut the ~ 5 secs of silence in the beginning!
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Im in no way an expert in any of this, but the main problem is around 1:10 where the backing guitar, top guitar, keys, synth,brass and some top lead synth play all at the same time feels a bit too much. Lot of them even sonically battle for the same space (especially the brass and synth)
You could try low-pass filtering some of the more backing elements to give more top-end to the more important parts..
I honestly can't tell you more. I'm going off of my limited knowledge, so take this with a grain of salt. Probably just come back to the song in a week with fresh ears and try to play with mixing, filtering, maybe some panning and see what works!