Neat little game.
Itch launcher failed on me, so I'll just leave here more detailed steps for any other elderly Linux/Ubuntu/Mint users.
To install java 17:
apt install openjdk-17-jdk openjdk-17-jre
Then due to space in the file name, run jar file with " ", if don't want to rename it:
java -jar "Cosmic Reach-0.1.11.jar"