Hi! Thanks a lot :) We already have a time limit in later levels, for example on level 5. You can get to it by pressing the level skip button, to the right of the level start button.
We also have foxes, holes, disease and RABIES in the game.
For more fun, I advise you to get acquainted with all the levels, at least with the help of the level skip button, it will not take much time, but you will see a lot of new things!
Thanks for your feedback :З