I think there are some cool ideas here that could be developed into something really good. I can hear where the vocals would've gone - unfortunate that your plans fell through.
Summer night:
Love me some big bombastic synths and e-drums. The clickiness of the kick drum could stand to be tamed a little. I'm looking for a hook to grab onto - feel like this one's probably suffering the most for the lack of vocals. Without the main melody, it gets a bit repetitive.
I think the composition is pretty. I can buy it as an acoustic pop ballad. This one's got more going on, though I think the vocal line would have done a lot to fill it out. The guitar sound strikes me as pretty MIDI-ish - I'd recommend adjusting note velocities and timing to simulate strumming, which hopefully your VST or DAW can do automatically.
good bye:
Really like these chords and the sounds you used. I like the SFX as a storytelling idea, but the way they're mixed is a bit jarring (the door slam, particularly). The buildup is cool, but it doesn't really give me sadness/heartbreak - it's melancholic, but the way it builds reads more mysterious and uneasy to me. Before I read the project description, I thought it ended with one of the characters getting abandoned on the beach...
All in all, I'd say this is a solid foundation, and with better luck with logistics and a bit more polish, it could be awesome.