Really interesting concept and lovely spritework! As others have mentioned I only wish the lava was not there at least in the beginning. I am not sure if the intention was to figure out what each creation does on your own or if it was planned to have more detailed explanations for what each creation achieves but at present not really knowing what something does and also having a time limit feels quite pressuring and there isn't much room for experimentation. Not only is there the lava but there is also the happiness of the dwarfs so you have two separate systems which add urgency. I think starting out with a small room where you don't have lava and can test out everything at your own pace and then are brought to the lava room to test out your mastery would be a great improvement. Nevertheless, in game jams time is limited and it can be hard to predict what things are clear and what isn't. This is a seriously impressive level of polish and idea execution for a jam so well done :)