Your carpentry looks really nice, as does the bucket system.
Everyone who builds a greenhouse for the first time will underestimate the amount of ventilation required. I went through it, too, so don't feel like I am singling you out. You're going to want to improve it in that regard. A big window or door on the opposite side of the existing door would help a lot, creating a cross-breeze.
If you have a heat emergency, throwing some mud over the top will cool it down. If you're at the end of your season, you can use diluted white latex paint, but it's not coming off, even with a pressure washer.
Also, one of my greenhouse suppliers is adamant that contact with treated lumber will corrode greenhouse plastic. I haven't seen it happen yet, but it's something you might watch for.
Good luck with everything.
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