Hi elite911! Sorry for the delay; I haven't been able to check the forum as frequently and overlooked your post.
The crash that you are seeing in the Arduino IDE appears to be due to a known issue in the older version of the Arduino IDE you are using. Please update your IDE to 1.8.12 to see if the compilation proceeds differently.
Also, it looks like you may have added a number of extra includes to your GUIslice sketch (pokusaj.ino). Most of these can probably be deleted as the GUI should be able to take care of that for you.
To David's point, it will be much easier to adapt the Aquarium project (looks great BTW!) if you can match the hardware to the project code, but I understand the challenge you may have with accessing parts. Looking at the project code that you linked to, the iAqua GUI (using UTFT) is heavily integrated with the program operation, so it may be a lot of work to port

(As you mentioned in your first post that you are relatively new to Arduino, this may be a big task).
Nonetheless, if you are still interested in creating your own, I suggest updating your version of GUIslice (from the repository directly
https://github.com/ImpulseAdventure/GUIslice ) as your version (0.13.0) is quite old and there are a couple important fixes in GitHub that aren't available in the Arduino Library Manager yet.
As usual, the first step should be to confirm that you can successfully run the mcufriend_kbv examples (eg.
graphicstest_kbv) with your current display. It wasn't clear to me what touch controller is associated with your display, so we would want to confirm what touch libraries work properly with your display too.
good luck!