As a youth Kristal began his career with Harju JK before moving to Tallinna Kalev in 2017.
[1] In the 2014 Summer Cup held in Pärnu he scored for Harju against Nõmme Kalju FC with the goal being compared to James Rodriguez's 2014 FIFA World Cup goal against Uruguay by local media.
[5][6] On 15 July of that year he made his senior debut as an 81st-minute substitute for Zakaria Beglarišvili in a 3–0 victory over Tartu JK Tammeka.
[14] In April 2023 he captained the national under-16 team again, this time for an UEFA under-16 development tournament held in Malta.
[15] In June 2023 Kristal scored and assisted on three goals in a 4–2 victory over Lithuania in the Under-17 Baltic Cup, again serving as captain.