Yup, you're quite right, the ending in this one isn't anything that special either. There is a hard mode afterwards but that probably isn't your cup of tea as a non puzzle lover.
The number in the end terminal is indeed the total number of the "secret" terminals but not all of them are needed for the solution. One could probably solve it with only 2 or 3. I'm gonna tweak the ending puzzle a bit to try to make sure that people don't miss out on the hint image.
Thanks again for your insights!