I've been playing Tiny Heist for some time now and just happened to find something of interest that has been bugging me.
The image is a png file found in the package contents and shows icons that are often used in the game. They include but are not limited to; the shopkeeper's face, helicopter, guards facing different directions, numbers and letters, wall textures and collectables.
However, some unseen icons featured in the image include the following: currency symbols, arrows, a cube, an envelope, an empty and filled heart, a sad shopkeeper, fractions, an asterisk and gibberish text like the type to be found in Doki-Doki Literature Club.
Perhaps this image is an easter egg T.C. left on his last HTML game, or something entirely different...
Anyway, to find the image on Mac (I'm assuming that other PC types use similar names), go to packagecontents>contents>resources>data>graphics>7drl.png.
It's something worth looking at.
Image below ˅˅ ˅˅