Yes, using the small SSD1306 OLED display. my little temp sensor compiled, Sketch uses 7560 bytes (92%) of program storage space. Maximum is 8192 bytes.
Global variables use 143 bytes (27%) of dynamic memory, leaving 369 bytes for local variables. Maximum is 512 bytes.
So you do have some more space to add some other code to it. Have it running on a 9v battery, then using a voltage regulator to bring it down to 5v. Looking back at this old code there is room for improvement for sure. As when I made it, I was just starting to dive into AVR programing. But good luck in your project!