Ren was super adorable, and Ai was so amusing - and Takuma's pursuit of Ren, and his friendship with Ai, was truly beautiful and charming.
I too would honestly adore a sequel, just because I want to see more of the characters. Though I totally understand your rationale for not... although, troubled waters for me is always a compelling moment in every romance, that leaves it stronger at the end.
Whatever you decide to do, you're a fantastic developer! All that in just 60mb is unbelievable! Thank you, and good luck with whatever you decide to do in future, I shall be watching with interest!