If you want to support this dev and his/her work. Promote this game on social media for it to draw in more fans and support.
Examples of other places to promote it on:
- Aether
- Mastadon
- Steemit
- Lemmy
- PeerTube
- imageboards such as Gelbooru, Danbooru, Sankaku Complex
- Baraag
The imageboards for example is how I found out about another recent game that quickly drew in fan art and aided in it's popularity.