You did a great job soldering the PCB!
The push button, top RHS side pad, is lacking some solder flow through.
Note: you can use a Q Tip and Isopropyl alcohol to clean up any flux.
I suggest you put a red/white mark on top of the micro controller near pin 1 & on the PCB near pin 1 to remind you to plug the chip properly.
In the future, you may also want to keep the components as flush as possible to the board.
Good work.