Day | Stars | Language
:-: | :-: | :-:
 1 | ★★ | Python
 2 | ★★ | Python
 3 | ★★ | Python
 4 | ★★ | Python
 5 | ★★ | Python
 6 | ★★ | Python
 7 | ★★ | Python
 8 | ★★ | C#
 9 | ★★ | Python
 10 | ★★ | Python
 11 | ★★ | Python
 12 | ★★ | Python
 13 | ★★ | Python
 14 | ★★ | Python
 15 | ★★ | Python
 16 | ★★ | Python
 17 | ★★ | Python
 18 | ★★ | Python
 19 | ★★ | Python
 20 | ★★ | Python
 21 | ★★ | Python
 22 | ★★ | Python
 23 | ★★ | Python
 24 | ★★ | Python
 25 | ★★ | Python

Notes:
I originally planned to solve AoC 2020 in C#, but somehow I ended up using Python for most of it!
I found day 20 to be definitely the hardest/most time consuming.
It took me only 5 minutes to do day 18, because I had the tokenizer and RPN solver already done and ready to go xD