I thought exactly the same thing. The rest of the tune is funky and syncopated so the whole-note block chords seem kind of clunky to me in comparison.I do think the keys could be made better use of rhythmically.
The drummer needs to watch his time when he plays fills (and you need to help him stay on the one as he comes out of them). As others stated, the vocals could stand some compression, and the singer some mic technique. As someone else stated, it might be nice to double the guitar and bass for only a small section or sections of the song so it doesn't get monotonous. I'm not trying to attack the performance, just making arranging suggestions that might help bring out something you guys hadn't thought of. Since you've asked us to play back-seat producer, this is pretty much what a producer would do; make suggestions that help to bring out the best in your band's performance of the song.
Some of the sounds are a bit rough, but the equipment is new to you and learning micing techniques, and recording techniques in general, takes a long time. Considering this was done right out of the gate with little experience and brand new gear, it sounds pretty good. It's a cool tune with a lot of potential. Use your new recording gear to record every rehearsal and you'll learn a lot very quickly. Try recording the same instrument with different mics or with the mic in different locations. Pay attention to what differences these subtleties make. A person could spend ages just exploring the different ways you can mic a piano. The same holds true for guitar amps. There's so much to explore, and I've only just touched on micing! EQ is a whole other learning curve in and of itself, and that's still before we even get to any outboard processing like compression, reverbs, gates or delays. Multitrack recording (or recording multiple tracks to stereo) isn't something you learn overnight. It's a lot of trial and error, a lot of reading everything you can get your hands on, a lot of jumping at any opportunity to work with people better than you that you can learn from, a lot of doing things wrong and learning from them. Just keep doing it and you'll start to hear the answers to your questions, if you know what I mean. You're already on the right track.