I loved this game and the gameplay loop is one of my favorites I've played from this game jam so far. I want the song that plays when you're collecting gems as a ring tone :D Its incredibly catchy. Love the art, love the character designs.
Being able to reignite lamps would be really cool to add. Maybe make it an upgrade card that you have to spend resources on or something? It feels a little bit empty with no sfx from enemies or your attacks. The music is great, but it just feels like its missing something without the sfx.
Overall, I really hope you continue with this. I could see myself sinking a lot of time into a full version of this game!