This is great! I feel like you don't see isometric games done at this scale often—for, well, obvious reasons—but you did a fantastic job with the spritework. The time limit was very generous, which honestly I appreciate, and the puzzles were simple but interesting. (Embarrassingly what stumped me the longest was... figuring out that I needed to enter the code and then # on the keypad, hah. In hindsight: yeah, obviously. In the moment: no thoughts, head empty.)
I think the only things I would've liked to see are a text box or something at the console to tell you how many keys you need to find, and some way to swap iso controls. The one used by the game isn't my preferred and, like, I got through it with only a minimal amount of wall-bumping, but still.
Overall, a fun little game. Congrats!