Thanks for the praise! We put a lot of effort into presentation! I wish we could take credit for the music, but all audio is licensed from various souces, we still made sure to grab what fit best though!
Good work getting a Saintly combo - it's hard to catch sometimes!
As for the theme: We started with the core idea of monsters or helpful items spawning from doors - while we kept that core, we ended up choosing to put most of our effort into refining the whole experience to make a solid enjoyable game. That's where the whole *doors sliding on rails* thing came from, and we had initial ideas for a "demon of doors" to be the big bad as well, but it didn't end up in the final release. So, I understand your comment on this!
Thanks for the feedback and thanks for playing!