Second one was decent, the others weren't the best. The kick drums really didn't fit, maybe try other higher-endish percussion. The melodies where meh, try putting more time into them, you want your melodies to make sense and be catchy, you want them to stick. Your chords also don't sound right, they have notes that are off, try listening deeper to them, you'll know they sound wrong. The third one definitely had some mixing problems, I would use stereo imaging to give the instruments more space to breathe, maybe eq some things here and there. What DAW are you using?
