Ok I've finally encountered the shop a 2nd time on floor 52! lol
Finished my first run last night. I will say shops became a lot more common once I got past floor 70 or so.
Overall I had a lot of fun. I will echo the sentiment from other comments that some of the hitboxes are very tight when walking through pathways, and sometimes when attacking. Great initial release though and I look forward to v1.1!