Did I wire this properly? or is it going to explode and then swallow the ground from beneath me

[Piotr]

@NoobKing

In the schematic, the micro controller has 3 GND pins on it,

I didn’t searched for this microcontroller but microcontrollers in cases without grounded thermal pad frequently have VCC,GND pin pairs located at their sides. And at each pair there should be blocking capacitor and GND and VCC should be connected to all of them.
It is because of EMC. The area surrounded by current pulses should be as small as possible. The shortest way back for return current of pulses at uC pins at right side is if there is (inside uC case) the GND wire from right case size to chip (imagine the chip as a small point in the case center). The same for other case sides. Also power pulse currents should have as small area as possible so it is best if VCC and GND wires (inside iC case) are parallel and close to each other. So next to each GND pin there is VCC pin and at each pair there should be blocking capacitor to let power supply pulses have as short way to IC chip as possible.
See the PCB I showed (for different reason) here:

Approaching PCB track routing for a newbie

Positioning for me is the main work in designing PCB. If each element is where it is needed than routing is simple. Till now all my PCBs are 2 layers and all of them have GND plane taking 100% of bottom layer. So except GND I design my PCBs as 1 layer. I use microcontrollers in QFP packages without thermal pad at bottom. This allows me to go with VCC under the microcontroller and go out through all corners and all VCC pins. That way GND and VCC don’t disturb my signal connections. At all digi…

At center is uC. You can find 6 pins connected to VCC (VC) and at each of them there are 0402 capacitor to next pin that is connected to GND (all vias at this picture are GND).