Solid game, the upgrades were an added bonus.
Piece of unsolicited advice: I recommend adding a unity web build to get more plays. Also do some marketing, play other games in the jam and rate/comment them, others will usually rate you back. Post in the Jam discord to ask for more reviews. If you get under the average number of reviews on your game then you will get a score penalty. This is to prevent a game from winning with a single review