For those who weren't around in the 80s(!) and are wondering what this is about, you can play Head over Heels online[1] and there's also a Retrospec remake for PC and Mac by Tomaz Kac[2]

[1]: https://archive.org/details/zx_Head_over_Heels_1987_Ocean [2]: https://archive.org/details/Head_Over_Heels_game