For such a simple game (especially in a game jam) make sure your game is html5 as more people will play it. Also the optimization is terrible I get that its a Jam game but my computer(Pretty good) runs faster on crisis then your 2D pixel art game. Other then that you've got a decent prototype. Just Polish add more content maybe a few more lassos or animals to capture, that way you've got more progression. Also one more thing no music is better then bad music I get Bosca Ceoil is easy to use but just use free music online if you've never made music before. You don't want to bog your down your game with bad music and deter any potential players.